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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21b086463d2df420392c240b7b433f99102810ae000ad4f8f9a4ac60ab30f93b' 
  AND token = 'S5JYaSGMMOUkT0XdRllnCTfXgC8FXLkAa8FC668qJUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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