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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70411cd007430c2b6bdbe9dbc79b3c444d8a787e443212f970ad5a15ab9918b4' 
  AND token = 'qaJHBcEcEl9F6HoVSTO7AFlBzhB7dcGwuXdUgbr8DQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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