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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e3935da722f1825c0d8e3caa72fe34b66ad26a1f74fd367d9df3f8a720bc1a7' 
  AND token = '0d1k6TH9KQfE4P/DVqx81dHErBfpScKMDf3YNWHpBhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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