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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '883c6dab772b3e9069007189313effb2d5197292faf9c1e328d75d4d2c9f457d' 
  AND token = 'PeD8t1W8ZdCs9QJ6x5ecarfN6EWDGiXpM1SBJ6OQzp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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