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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '129bc11117be1701ca0140498f77f2d5d2d1d46a20b7104ae641ad5d7c636b5c' 
  AND token = 'KddX8lp4oc/7YVJkC09ZEaQcAsqwi8RRDrvpbKQ7Lbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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