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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef7624cc80a309a7a40e304c0b4ef9e022556a3e54101c9998c4f278b33eef2d' 
  AND token = 'resPCKV4Ev6Hyvjhi3MmR9kHrDRh3yNze16GW5jyraI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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