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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d415e6b5da43d8275cc324b7ff0f8176e8599d4cfb5c544c9d2ef6cf0c16034' 
  AND token = 'EU8lDzzhVmGcCdjJk61RbYNXJtIh29e/PebumOGCRWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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