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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd803f7e9c4361a922a99c5203d46ed3c92f3e8690ca21028f54c8018d197b65a' 
  AND token = 'bw0QpExnjh61wS/ccUBC5/5SJHEqQXISIF+gbBNOfe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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