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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0da84855b3bd54795e55a9118d0dff2874b54a506a3ef4156e197360dcc9bc2f' 
  AND token = 'v4BTYm6lCKLfC+sg4NQy0volqU/yxDbqX1i2kebnXq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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