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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'facbcc0d12bc5fe8b7013199a1457f44e42144bca3e896ae1f5647f1a80c5eea' 
  AND token = 'eUpZkOIcyz7Ed+BaXx4Gz6CvaMnZi/93nVrW8OyIvDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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