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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '591073fcb9cd6bf7980fd0f06bf6d9837c26a9e6b8cffbd5be8ff3519ed3af90' 
  AND token = 'sFBOw2hSqcRkBQLKzdtANUbcOMxgxcoGHu3I34njgUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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