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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa0d168c57755bec7e72f8f9ebfe1662ecf70f6e2eb1af35db21bc7ac3fdcac2' 
  AND token = 'x4r7tg7CNRE1c16aIQPrdGVUQteQywlsOFl3ibkzOAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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