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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'defe17b3391a38a4f4f5bdd7af5f494f50bab98c28c652670890eee170a9d708' 
  AND token = 'HAY8DwJB+/0Z/8XTg4rxclAJZeS1x9Lweby+paC5iVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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