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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '514ee8aa0fa41e1d8fb2a1f7ae4bf0b10fb9310eb8b63c44b72bb77923f4652d' 
  AND token = 'Pr9h/QyWL6He7yLy18dP7rskU6ZaT84wz6cGUEXN7D4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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