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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daac6e969848207b46aaeeb3d89041b781a59438407f254e86cd7bf0cfc8d6e7' 
  AND token = 'oBqZaSHBjmJTI32GDEoZ4xZjL6Q1GwOv1l776nV6T4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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