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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '969ea5787321dec4e0c97451099128039c9b484dbc1b920f6753006e55ba6bae' 
  AND token = 'TL++m4ZMZq+WelWPkHfPCSh8Y7HT5HzeYg3R6pBLpV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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