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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5892105fe78aeba84435bbf01223be80ba1ea6624eb9c63b13d02a84056e3e5' 
  AND token = '7XIL329sEvtQ74d6fwnKVPlqo+CLigPP9I2wujSrZbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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