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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2aebcaf02f4a68c4934370eb1edfbf9c07cdc848cacc6feeff8c7f55ff6f199' 
  AND token = 'wqp3oiU9QCqHEDM5spdghHopLHaxyG3Q43slpyYbEh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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