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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cfb60643aaaac087e70b0f8288712b90fb2b4d84b4f450fb4761fa53e4bc34b' 
  AND token = '8ZrKJEUFYaz4C12jyTL6exA7hue/lglaGC6l+uVR5FE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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