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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5a16413ef002407628b220fd897321121d8c1abc2302b13fb78218edc064c17' 
  AND token = 'b8ubC0MK2glQpb2iA3Mb12aRq4S3V/ay+YwJCeGz3UY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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