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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef0ec6707657542bc4172b477a9f4be517585aadafcf70ba9ae453aa98e9b8f9' 
  AND token = 'ilhzNZz6frFqLY5KMAuK3yLgDponeR/dzY0j0OsugSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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