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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c04123d43a65d2d5356497fff1492548c1bd939159dc3733d161e18494cdb956' 
  AND token = '+q9KPJX0HZrt38r8TIiJq+mcJt8gayptF9DlhIuEjYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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