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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aea2dc4e9dc55f7c7436f2472cc783321bc45165ce40b158dacb073fd3ce9b10' 
  AND token = 'ut4FxjWm7iGjW5OeC2rbeR7WrkddB3j1o9Nr17jzq3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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