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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c8c70a667938690b164cb93229cf31f55ed318f81683eb129b1dc3f38d586f6' 
  AND token = 'zrSdoZ0c+Xhd2K2LGPnoYhX9QHn0Ml1UokW0nT032kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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