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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b67cee261e44a7016df3ee66048ac05ed02708f43c53213653bf9e8479fb5947' 
  AND token = 'u5niD7XJf/iAweUzQeCqtiI4N/rjRxMe+7UHyb9rPu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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