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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52a1fd55ceced94766de4a1dcff4d99a55fa69c8d7b5480922aef38f51d98ebd' 
  AND token = 'zKmgXKYKMIC2IhGloTeVzOv6oIoIjG9eDPdJkTWqxx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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