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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24142f8b525d6c9bcab61d47103e28845eb488f9052cf9962f58484d94dca86b' 
  AND token = 'IefZBY3q6jgdeAst+Aw4J5B1885AbGUWhDD7ru+K4Xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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