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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2891e1b82ac3b8bdda83ec2d5962f6f1b80decd1725a6d69e1ce879d1fde1cb4' 
  AND token = 'afI9bPnIQStulAfwvNQQRfOFGOSm67tcvexEc2KQcqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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