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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab6cea4e8165a54517399b5265a07dd1e9935c0b2c0577aff264a1f609786b78' 
  AND token = 'd3AtluVRYql1dQDw4+l7x37Y5mbE1yL/qadH8wTqRJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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