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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adbeb5c2f41e8466cfdd1d8b3d94305e1eda5af932273bca2c7d3cc2d13f22e2' 
  AND token = 'Z64KdSYKFRjExfqf13qbToyyNDLkuLYw4QyL5UvJLCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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