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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b26f68f572f3b5b2735799c8cf14704d01d3c1de0ec56d55988e62d784a32a6d' 
  AND token = '+6c+NXp2epAN5MrsxjiedUMaAUjmlBwBnPAGWS975yA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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