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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19fec6f1f1eb1c3269743080b3d760a34486bf76edc3b7f1ac81669444898acc' 
  AND token = 'OBZA6bKGl+mXZH8RXZ8kEGXwcypBhSK1mtbA7ItkVxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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