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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96e524155dee4eb36b217e5df95e019ac9c485efa1d04fc3037e416c4534dfba' 
  AND token = 'KIMKDPbbmOKNmMFhw6GBdUMR242M33yFFcknJ7fiPkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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