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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '672cc1d82b7f9b6ba260a88c5369731ec58d97bd10d475350d9a6170d3eebf19' 
  AND token = 'myFmmhMIlflFghvamV4PDNUAE8bQ9n13e+yyauD7fe8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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