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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '039c1ab417dd0d8787dec9920ebb0609e45b81b64426952983b199d575111e71' 
  AND token = 'wdFGHAlu2OEEdNXJ1yO6+l2+n6U029iH2vmq7rPP1mA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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