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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fae9cc1c1ad61b396b6950886acb1dfe53d740ae31bb93b6133219bc953599f' 
  AND token = 'TlFuB4LtLwAgwOdthj4AwMVCFyhWRL5x867TurAh0I0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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