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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66ab3c57fec4d77a8f1fc28ef04007f17506d6635377c66a4bd435df7a7484e2' 
  AND token = 'daKQ2UNWadnIvnaBOITRCSTDczAL57Z3M4IdifRBgME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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