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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e086dfd550642a647c43c8b115f3a229f8244ae96ea0e3188c0d3f86f5dd8e59' 
  AND token = 'smb+XDzFxqKI6lBmjc7YtuhcZcRzM7c2d0n3s7mXfQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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