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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b385971767cc78180e95f2cb19b930d36d690fc1c0bf112e911d93f5f74464bb' 
  AND token = 'XWOukVVWYi3q3CyqQb7N0OVZo3cC1S/PwK7y50UAOB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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