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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e1f3d1e1b3a96f21b961f64fd29e00220dba6c9a95c40bc288f576f7b6f0dc6' 
  AND token = 'XF84PADjkv7NQqIVi47Eji8ZF9sx41CxFiWE5Jfg25k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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