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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ace70b2f86c3b34932ecc63b47203456f3b016045494a2bddafed113ac41fe6d' 
  AND token = 'bDJcKmCswAH49cvEbyt1sk7pUTTHm3lEVmJ6KfULSAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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