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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59026945adbc61f82e568476003bb9f7591f51599ea4bbce89ff517551d5d98f' 
  AND token = 'N1wtiXaisfqJexSGxBSzgqoiQ4rbJCty2uJZ7DxSFpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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