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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '844d689cb78ef7605676d1a038aa4540d4a563147d321cf728f81ec9b3473d8c' 
  AND token = '7s+mhV0Dio554KfH8oAfJGu31A1R3rJSC5rHSKkVLks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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