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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45e82bc45c90e34a935ae0c19567b6dd587548e27468daa49300b858f75f01e1' 
  AND token = 'mUEapv3mJUn04D6U18kHl5RJawHMQ+/QEqDGiHzxoW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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