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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72d458bc7b3372eb85f1313207831812beca220a845e846fa8574876d32193ea' 
  AND token = 'eQROYohmguu4c+fuNi5TY2Sa/HS82DjYqx38N8yZo+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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