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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7cc8a3dcc3f432b993075f47e285ba5a5b8bc7238ac042e9a92d3874e6e3f35' 
  AND token = 'FQ0CsUqWlpnkJEwAjSghsyNlxYc86XSNygxlKOz6GTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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