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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ced32f7f1c6460147461c84349167c7923648ab5ca4f0b6a45983d4e9f43ac26' 
  AND token = 'rjYe9Y+LTTk5NogIdORNagLqWOmCdzoVr9dXwYNbu14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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