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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a5a9ad9187c53a8e23ded2138204c788197f1e76735916c76d4d555c3ce69d9' 
  AND token = 's4gPpzupNEHnVu6JrH5MCebVbl7fgphnrU9Is5fBSfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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