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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a1e56ae09c8e1158b0fe2517da1cd752add6042521f0d60886536743c0e9c8f' 
  AND token = 'c330r5Xr4EUyENlcGl2TklcUxFU4QQ/ZWUV77MeeEl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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