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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7d202a4675203cc75614abaa62f64c364928c3744de0feea210cd5ef6d79f1d' 
  AND token = 'Fu2u8S2OBo/07v8YSMQAS52xbfqzJwzEu/zUbyFcQnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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