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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8e023b7d7b90118450426dade3f6fde2b4cb660e4d2811784073ae079580a67' 
  AND token = '2OlXlnfk6Fe4Cy45qezN321BUOb/IOo6/bTAR4bwazc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}