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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8574cc51174ac75cc62a05d8ce22fac7cbef4cbc620bac21c54e23e7b27df7c5' 
  AND token = 'qpRWlvKQUVjr/yaYCa/ISLI0SLdFmB3v6tz+DvTtZCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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