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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4b7daf92c549e3eb724c67f4df0d3b11e540b9c07f48a74293df7a5414bb2d7' 
  AND token = 'wyAn3z1PVy1yzww0i3VGdMZL/YBPuHlwrQHbK15ob/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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