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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35c55c323f17c866b38c4564248737de36ddffe62e64fe5e7bfe502273dbde37' 
  AND token = 'ZJ1EwFnI1xx7jhlJh4dvkXMiN1tch4OzRlrDmKmoGmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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