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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca9b7470880c68440536b9f32d7f64c77b1f0e8ed9b84daced2d65530b3fd487' 
  AND token = '3oQicOlVSJflOcvv1yECER1aWg3s8ruU/4VRvB0eM4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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