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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98b8ce607d9982983e84f1999a54ee0650bb5e7243e336c6321ae03651e7d414' 
  AND token = 'M8lpeKjv0ORElA5OJD6LBSUNdYvYXl6iIiFyz/JKO2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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