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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce153839b0b833a4186b2e36a040ee55e19b17cbbeac12b50e4891758cfca067' 
  AND token = 'GvJ1KxZ7qXLzD4t651+BTdfphxaa+DFuE0rjCR9OCWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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