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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce95d61fb9d4ae2261af5d9e682586cd73f8f70625a64fbb8e68bf524e56cef2' 
  AND token = 'vkyRWH6gA2DURhnFyL8GXEzEThYYMivgro/LRzwneCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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