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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ddc2527552033e586e3fcc736247b5b9b08ff4598ae9cb61b75661cf1fc2032' 
  AND token = 'yEZ/9XDbHPtmTATLK+j+AXdVL6V+H67rbK6xxSdU5nQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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